![]() Port 20 is the most commonly used data connection port for FTP.The data connection is usually where most of the confusion and problems arise for FTP server administrators. When an FTP client uses the control connection to instruct an FTP Server to send a file listing or transfer a file, the actual data exchange takes place on the data connection. ![]() This is the connection through which an FTP server exchanges file listings and transfers files. ![]() The second type of connection is called the data connection. If the port that an FTP or FTPS server is listening on is blocked, no one will be able to see or connect to the FTP server. However, if the administrator is running a software-based firewall, the administrator must be certain that connections are not blocked on the port chosen for the control connection. Using these default ports is not mandatory – the administrator is free to change the listener to use any free port on the system as the listening port.
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